
If you are running any PowerPC-only software, think long and hard before going beyond OS X 10.6 Snow Leopard, the last version of OS X to include Rosetta support for PowerPC apps. If you want to go beyond OS X 10.7 Lion, the first thing you should do is apply the EFI update mentioned directly above. Be sure you only use a UPS with sine wave output to avoid reducing the life of your Mac Pro. The AC power coming into your home or office is a sine wave, but some UPSes generate a square wave when you are operating from battery power. See Install 64 GB of RAM in Your Mac Pro 1,1 or 2,1. Earlier versions will only boot with 32 GB of less.
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However, the 2006 Mac Pro will only boot with Mac OS X 10.8 Mountain Lion or newer. It is possible to install 64 GB of memory after installing the firmware update.
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Oh, and did we mention this was the first 64-bit Intel Mac? Unfortunately, it has a 32-bit EFI – but Modernizing the 20 Mac Pro to Go Beyond OS X Lion by Robert Bryant explains how to change the boot.efi file so it can run OS X 10.8 Mountain Lion and later.

As little as 1 GB of RAM or as much as 16 GB. The buyer can choose from two dual-core Intel Xeon Woodcrest at 2.0, 2.66, or 3.0 GHz. Apple introduced the Mac Pro as a fully customizable quad-core computer.
